Abstract
The WLF relation connecting viscosity to temperature is used as the basis for a formal description of the compositional variation of blend viscosities. An algebraic manipulation and the use of the cognate pure-constituent Williams–Landel–Ferry (WLF) factors provide a means of introducing composition and pure-constituent viscosities explicitly. Further progress follows through the use of a predictive theory of the compositional variation of glass-transition temperatures for random, single-phase blends. Particular versions of a general relation so obtained are explicated. The theory gives as the simplest case the bench-mark linear rule of mixtures, from which it is clear that both positive and negative deviations can arise. © 1996 John Wiley & Sons, Inc.
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